公开(公告)号：US3938893A

公开(公告)日：1976-02-17

申请号：US520510

申请日：1974-11-04

申请人： Yasuhiro Nanba ,  Seiji Yamada ,  Motonobu Matsuda

发明人： Yasuhiro Nanba ,  Seiji Yamada ,  Motonobu Matsuda

IPC分类号： G02B26/10 ,  G02B7/36 ,  G02B27/40 ,  G03B17/12 ,  G01B9/00

CPC分类号： G02B7/36 ,  G03B17/12

摘要： A mechanism for determining the focus by an objective lens of an image on a focal plane includes a needle shaped or other narrow scanning mask transversely oscillated in the focal plane between the lens and a transversely extending photoelectric element exposed to the mask intercepted image. The output of the photosensitive element is coupled by way of a high pass filter or differentiating circuit and a rectifier to a meter, the maximum meter reading indicating maximum AC output and hence maximum focus. The output of the photosensitive element is also connected through a low-pass filter to a meter or exposed control mechanism.

摘要翻译： 用于通过焦平面上的图像的物镜确定焦点的机构包括在透镜和暴露于掩模截取的图像的横向延伸的光电元件之间的焦平面中横向摆动的针形或其他窄扫描掩模。 感光元件的输出通过高通滤波器或微分电路和整流器耦合到仪表，最大读数表示最大AC输出，从而指示最大焦距。 感光元件的输出也通过低通滤波器连接到仪表或暴露的控制机构。

公开(公告)号：US3936842A

公开(公告)日：1976-02-03

申请号：US481811

申请日：1974-06-21

申请人： Yasuhiro Nanba ,  Motonobu Matsuda

发明人： Yasuhiro Nanba ,  Motonobu Matsuda

IPC分类号： G03B7/089 ,  G01J1/44 ,  G03B7/083 ,  G03B17/18 ,  G03B7/08

CPC分类号： G03B7/083

摘要： A light measuring circuit for an exposure time control device uses a photodiode to measure the object brightness and a logarithmic compressing diode to provide negative feedback between the output terminal and one input terminal of a differential amplifying circuit. The output of the light measuring circuit is summed with signals representing film sensitivity and diaphragm aperture setting and the resulting exposure time control signal is compensated for changes in temperature. An antilogarithmic converting circuit generates a signal proportional to the logarithmic value of the compensated exposure time control signal. The antilogarithmic converting circuit operates at the same reference potential as the differential amplifying circuit and its output is integrated and then used to terminate exposure.

摘要翻译： 用于曝光时间控制装置的光测量电路使用光电二极管测量物体亮度和对数压缩二极管，以在差分放大电路的输出端和一个输入端之间提供负反馈。 光测量电路的输出与表示胶片感光度和光圈孔径设定的信号相加，并且所得到的曝光时间控制信号被补偿温度变化。 反对数转换电路产生与补偿曝光时间控制信号的对数值成比例的信号。 反对数转换电路与差分放大电路工作在相同的参考电位，其输出被积分，然后用于终止曝光。